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53 lines
2.0 KiB
HTML
53 lines
2.0 KiB
HTML
<p>You are given positive integers <code>low</code>, <code>high</code>, and <code>k</code>.</p>
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<p>A number is <strong>beautiful</strong> if it meets both of the following conditions:</p>
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<ul>
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<li>The count of even digits in the number is equal to the count of odd digits.</li>
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<li>The number is divisible by <code>k</code>.</li>
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</ul>
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<p>Return <em>the number of beautiful integers in the range</em> <code>[low, high]</code>.</p>
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<p> </p>
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<p><strong class="example">Example 1:</strong></p>
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<pre>
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<strong>Input:</strong> low = 10, high = 20, k = 3
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<strong>Output:</strong> 2
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<strong>Explanation:</strong> There are 2 beautiful integers in the given range: [12,18].
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- 12 is beautiful because it contains 1 odd digit and 1 even digit, and is divisible by k = 3.
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- 18 is beautiful because it contains 1 odd digit and 1 even digit, and is divisible by k = 3.
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Additionally we can see that:
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- 16 is not beautiful because it is not divisible by k = 3.
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- 15 is not beautiful because it does not contain equal counts even and odd digits.
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It can be shown that there are only 2 beautiful integers in the given range.
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</pre>
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<p><strong class="example">Example 2:</strong></p>
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<pre>
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<strong>Input:</strong> low = 1, high = 10, k = 1
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<strong>Output:</strong> 1
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<strong>Explanation:</strong> There is 1 beautiful integer in the given range: [10].
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- 10 is beautiful because it contains 1 odd digit and 1 even digit, and is divisible by k = 1.
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It can be shown that there is only 1 beautiful integer in the given range.
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</pre>
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<p><strong class="example">Example 3:</strong></p>
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<pre>
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<strong>Input:</strong> low = 5, high = 5, k = 2
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<strong>Output:</strong> 0
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<strong>Explanation:</strong> There are 0 beautiful integers in the given range.
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- 5 is not beautiful because it is not divisible by k = 2 and it does not contain equal even and odd digits.
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</pre>
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<p> </p>
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<p><strong>Constraints:</strong></p>
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<ul>
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<li><code>0 < low <= high <= 10<sup>9</sup></code></li>
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<li><code>0 < k <= 20</code></li>
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</ul>
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